Extension install

[acquamarin]

This PR allows the user to install an extension remotely from our extension repository.
Currently, only httpfs is supported installing from remote repository. The extension will be downloaded to the data directory, and can be loaded by load extensino [name] after.

[codecov]

Codecov Report

Attention: 11 lines in your changes are missing coverage. Please review.

Comparison is base (6c85123) 93.21% compared to head (3646b4c) 93.37%.

Files	Patch %	Lines
src/extension/extension.cpp	78.26%	5 Missing ⚠️
src/include/binder/bound_extension_statement.h	83.33%	1 Missing ⚠️
src/include/planner/operator/logical_extension.h	75.00%	1 Missing ⚠️
src/include/processor/operator/install_extension.h	87.50%	1 Missing ⚠️
src/parser/transform/transform_extension.cpp	87.50%	1 Missing ⚠️
src/processor/map/map_extension.cpp	90.00%	1 Missing ⚠️
src/processor/operator/install_extension.cpp	91.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2634      +/-   ##
==========================================
+ Coverage   93.21%   93.37%   +0.16%     
==========================================
  Files        1060     1063       +3     
  Lines       39342    39403      +61     
==========================================
+ Hits        36672    36794     +122     
+ Misses       2670     2609      -61     

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